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Make sure water supply is ok, make sure screen is clean, try all the different tips, make sure they are seated correctly. Water should come out of the hand wand even if not under pressure, this shows the wand handle is working, so if water come out it's not the trigger handle. You can remove the wand hose, wand handle and see if there is any obstructions also.

This can also be a stuck check valve, you might need to have it serviced.

sounds like you have a blockage maybe in your water hose ,ideally your water hose should be around 25 feet..or you may have an o ring in the gun where the tip goes.. is broken..that will affect your pressure..check also filter where water hose connects to the pump make sure thats clear

Hi and welcome to FixYa, I am Kelly/
First off, remove the water supply hose from the power washer and locate the in line filter. Most of them are a plastic screen stuffed into the plumbing just behind the hose washer. Others have a short stand off and the filter / screen may be where the stand off attaches to the pressure washer. Others units have in in line sump that usually has a blue or red cap that you remove to clean the sump. Find the filtering mechanism(s) and clean it.
After doing this... attach the water hose loose to the power washer and turn on the water supply hose. Wait for all of the air to purge from the water supply hose. Then tighten the water supply hose. After that... Squeeze the wand trigger until all the air purges out of the high pressure hose and you get a solid stream of water with the unit off. Once you get a solid stream of water with the unit off... power the unit up and see if the high pressure hose becomes rigid / charges with high pressure. Next.... cycle the wand trigger 1 second on... and then wait for the hose to charge again. Do this multiple times. What your doing is forcing the un-loader / relief valve to stroke in the pump. Until the un-loader valve stokes un-restricted; you will have pressure problems. Next after the hose is fully charged... cycle the wand trigger very rapidly until you get high pressure each time you cycle the wand trigger. At this point your done and can proceed with patio cleaning.

Should this NOT resolve your problem.... get as much water out if it as you possibly can and pour a few ounces of engine oil into the water inlet. (Easier said than done... but you have to get oil into the pump and then let it sit over night. once you have oil in the pump pull the recoil 2 times with the ignition off just to force oil through the pump)
The next day you go through the same routine as stated above. This brings about 80% of the stubborn ones back to life again. Should it still be fussy after doing all of the above... you will have to replace the unload-er valve. If you removed the un-loader valve for any reason... you must clean out the pump housing and lubricate it and the un-loader valve with white grease (<-Available at any automotive parts source) BEFORE reinserting either the old one or a replacement un-loader valve. If you attempt to use the old one with lubrication.. make sure to remove any debris from the springs and wipe the seals clean with a PAPER towel before lubrication.

Sounds like it may be air locked. Connect the hose to the washer. Connect the wand and hose to the washer. Open the supply water, and hold down the trigger on the spray wand. Be patient, this can take several minutes.Now crank the washer.Best regards, --W/D--

As far as pressure... hook up the water supply hose and turn on the water supply. Let the supply hose purge all of the air out. Then turn off the water and connect the high pressure hose. After that turn the water supply on again with the engine off and squeeze the wand trigger. Make sure all of the air is out of the high pressure hose. Then start the unit...
Once the engine has stabilized rapidly squeeze and let go of the wand trigger several times. Your exersizing the bypass / unloader valve spring. By this time you should have good pressure. If you have owned the unit less than 90 days and your sure you have a warranty issue use this link to contact the company: http://www.homier.com/contacts

Some of these units have a sliding assy on the wand that slides toward the ouput nozzle for adding soap / chemicals. If the slide is not pulled back toward trhe wand and locked into place you will not have any pressure either.

It appears from reading the manual that this particular unhit had 2 different nozzles. One for chemicals and one for high pressure. Plese make sure you have the high pressure nozzle installed. The BLACK nozzle is for chemical use. (page 5 of manual link above)

The red, yellow or white nozzles are all for high pressure with different spray patterns.